I need some leads to a good archiving application!

I have a 10 gig external firewire hd with which I store all of my mp3's & photography...

in my TiBook I have a 30 gig hd partitioned into 10 gig (X) & a 20 gig (9)...

up to this point I've been using the 10 gig external for file storage...but I want to find a tool that will allow me to have an automatic backup of my files from my 10 gig to my 20 gig partition...so I always have a real "backup" of my files...

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